Here is the owner's manual in .pdf format, which you might find useful.

Here also is a post made to some birding forum where the poster tested them, and posted their test results. This might also be helpful, though I cannot vouch for the forum, nor for the person posting the test results. As always, YMMV...

Just when I had it narrowed down to the 7x50 Pentax Marine, 8x42 Zeiss Terra ED, 8x42 Nikon Monarch 5, Endeavour 8x42, Captain First Mate 7x50 (Although they are almost the same build as the Resolux, which I hated it's eyepieces) and some other models I find this link saying 7x and 8x are better for whale watching when you are on a boat but 10x is better for shore whale watching.

Back to the drawing board I guess, will need to find a really big wide angle light weight if possible binoculars witch can possible be used for astronomy too...

It is true though, I remember my gf had Tasco 7x35's and I had Tasco 10x50's, although the 7x35's were a pleasure to hold because they were light weight, the magnified view of the 10x50's were much better...